I was opening the JCL directory from the JVCL 330 7z file (JVCL330CompleteJCL198-Build2509.7z) and for some reason not all the files were extracted.
One of the make files didn't extract so I did synchronize dirs and saw there were many more files which were missing from the extracted side.
I then tried to synchronize the missing files to the extracted side (copy/extract) and TC crashed...
Please let me know if I did something wrong or if I can help with finding and reproducing the bug, I can supply the 7z file (even though it is the JVCL330 off the SF/Borland site).